It’s now up on Grantland:
In other words, the zone blitz had come full circle. What began as a way to blitz without playing man coverage had started incorporating man coverage all over again, this time in an entirely new way.
Using pattern-match principles allowed defenses to overcome the deficiencies in both the manic, risk-heavy man-to-man blitzes and the easy-to-exploit soft spots in the zone-coverage scheme. There was now a way to keep the safety of the zone and the tighter coverage of man-to-man. Defenses had finally done for blitzing what Walsh had done for passing — keeping the reward but eliminating the risk.
Read the whole thing.